docs: def load_bioassembly_info_from_file(self, biomol_num):
          """Load metadata about a bioassembly (such as chains and their transformations) from a structure file.
          """
  
          # current functionality is to take in a pre-assembled bioassembly file, parse it's MODELs and get info from that
          pass
          from Bio.PDB import PDBParser
          p = PDBParser(PERMISSIVE=True, QUIET=True)
  
          structure = StructureIO(self.structure_path, self.file_type)
  
          structure = p.get_structure('tmp', infile)
          bioass_to_chain_stoich = defaultdict(int)
          for model in structure:
              for chain in model:
                  bioass_to_chain_stoich[chain.id] += 1
          return dict(bioass_to_chain_stoich)